Exploring The Node.js With MySQL Example Using Sequelize & Express

Node.js has gained widespread acceptance in both businesses & software communities. This is because it is a Javascript runtime environment that can be deployed on numerous Internet browsers. Today, we will learn about using Node.js With MySQL using Sequelize.

A key advantage of Node.js is its ‘Javascript everywhere’ paradigm. Thus, it streamlines application development into one language, as opposed to differing ones for client and server scripts.

A flexible and minimalist Node.js framework, Express incorporates many features to develop both mobile and web-based apps, some of which comprises setting up middleware, defining routing tables, and dynamically rendering HTML pages on the basis of passing arguments to standard templates.

Large SQL databases can often be challenging to manage and this is where Sequelize comes into play. Sequelize is essentially an Object-Relational Mapper i.e., it plots an object syntax into database schemas. This is accomplished with the help of Node.js as well as Javascript.

1. Overview Of Node.js REST CRUD API

REST, an acronym for ‘Representational State Transfer’, determines how the API appears, while CRUD is an abbreviation for ‘Create, Read, Update, and Delete’.

With respect to REST API, CRUD is the standard form of HTTP action verbs. Knowing this API in detail will help you to know the ways to utilize Node.js With MySQL.

To build REST API in a Node.js runtime environment, the user performs the following steps:

1. Open an Express web server

2. Add configuration data for an existing MySQL database

3. Open Sequelize

4. In Sequelize, create a Tutorial model

5. Write the controller

6. Define all the routes for handling every CRUD function

Note – Include custom finder in the definition.

7. Open Postman

8. Test the REST CRUD API

And it’s done!

To better understand the REST CRUD API exported, refer to the below table-

Methods

URL

Action

GET

api/tutorials

get all Tutorials

GET

api/tutorials/:id

get Tutorial by id

POST

api/tutorials

add new Tutorial

PUT

api/tutorials/:id

update Tutorial by id

DELETE

api/tutorials/:id

remove Tutorial by id

DELETE

api/tutorials

remove all Tutorials

GET

api/tutorials/published

find all published Tutorials

GET

api/tutorials?title=[kw]

find all Tutorials which title contains ‘kw’

2. Tools Required for Building REST CRUD API

There are a number of tools that can be effectively deployed to build REST CRUD API. Some of the most widely deployed ones are:

1. Express – Express.js, or more commonly known as Express, is a web application framework for Node.js. Express is considered de-facto for Node.js framework as it is free, open-source, fast, and minimalist.

3. MySQL– An open-source relational database management system (RDBMS), MySQL is backed by the Oracle Corporation and is free to use. Furthermore, the source code can be easily customized as per user requirements.

After knowing these tools, you will be able to decode the Node.js MySQL Example with the utmost ease.

3. Available Data Types In Sequelize

The data types supported by Sequelize Docs are as under:

Sequelize.STRING

VARCHAR(255)

Sequelize.STRING(1234)

VARCHAR(1234)

Sequelize.STRING.BINARY

VARCHAR BINARY

Sequelize.TEXT

TEXT

Sequelize.TEXT(‘tiny’)

TINYTEXT

Sequelize.CITEXT

CITEXT

Sequelize.INTEGER

INTEGER

Sequelize.BIGINT

BIGINT

Sequelize.BIGINT(11)

BIGINT(11)

Sequelize.FLOAT

FLOAT

Sequelize.FLOAT(11)

FLOAT(11)

Sequelize.FLOAT(11,10)

FLOAT(11,10)

4. Pros and Cons of Sequelize

Pros:

Sequelize reduces complexity by eliminating the subtle differences between various SQL implementations.

It also provides built-in middleware, thus enabling individual customization for errors in each field.

Note – A controller from the /controllers/tutorial.controller.js has been used in this procedure. The user must also include routes in the server.js. This has to be done just before the app.listen() ):

Conclusion

The advantages and disadvantages of Node.js With MySQL and Sequelize allows the reader to make a comparative study of the library, while creating the controller, defining routes, and testing APIs are vital from a smooth software functioning perspective.

FAQ

The simple answer to this question would be YES. To achieve this, you need to install and setup MySQL on your computer. Once you do it, you will be able to access the MySQL database with the help of Node.js.

Node.js supports all kinds of databases whether it is a relational database or NoSQL Database. However, MongoDB fits best with Node.js.

Sequelize is a powerful library of JavaScript that helps you to manage the SQL database. It is basically an Object-Relational Mapper (ORM). In simple words, it helps you to map the object syntax to the database schema.

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Enthusiastic for web app development, Chintan Gor has zeal in experimenting with his knowledge of Node.js in various aspects of development. He keeps on updating his technical know-how thus pinning his name among the topmost CTO’s in India. His contribution is penned down by him through various blogs on Node.js. He is associated with eSparkBiz – a Node.js Development Company from the past 7-8 years where one can get premium services.